We recently got a new VM router and I've been having the same problem with my SM-J500FN (2015): Not exceeding download speeds more than 4 Mbps.
Nothing seemed to change the speed. Wipe cache partition only solved it just for about a minute. Keeping the phone in flight mode with Wi-Fi on does solve this problem but you won't be able to take/make any calls.
Fiddling around with the phone, I decided to turn Android Beam off to see if that would change anything. After that I did a speed test and got a stable 56 Mbps. This seemed to do the trick for me. It hasn't dropped back to 4 mbps since. I did the same thing on my gf's J5 (same model, same problem) and it fixed it as well.
Go to: Settings 》 NYC and payment 》 Android Beam
Now, if NYC is turned off turn it on just to switch Android Beam off.
I don't know what makes Android Beam interfere with Wi-Fi reception on the J5 but someone might be able to explain.
Not sure but this may help with the J5 (2016) too. It's worth a try.
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Same issue with my J5 2016: initially I didn't manage to get speed higher than 4Mbps by wifi. Wifi router used is TPLink WR940N and ISP provides up to 300Mbps.
Both router and mobile comply with wifi standards 802.1b/g/n. 802.11n allows the highest speed, in the range 72Mbps - 600Mbps depending on NIC of each device, if channel bonding (two channels together for more band), MIMO (more antennas), etc. If you click on your current wifi connection on J5/2016 you will see that net speed of 72Mbps (phone built-in capabilities) .
On router side you must setup the highest power, use 40mhz (bonding). But check first situation of wifi signals from neighbourhood (interferences leading to lower speeds). Download a free app from MPlay like wifi analyzer. The app will show you what is freest channel for your net. Then I setup the router on that channel (chosen 20Mhz channel as 2.4Ghz band at my home is quite crowded and 40Mhz would't help), setup router on protocol 802.11n. Now I have constantly speeds >10Mbps...
Catalin Gherghiceanu tarafından